Hemianopsia - abaissement half of field of vision in each eye. There is usually in organic diseases of the nervous system (swelling, bleeding in the brain). There are same and opposite the hemianopsia. At the same hemianopsia drop the same side of the field of vision of both eyes - right or left. For unlike hemianopsia characterized by the loss or inner halves of the field of vision of both eyes, or external. Save each eye half of the visual field is called hemiji.